Soldering composition for aluminum



second grade tin.

I FLOYD A. ALBERTUS, 0F MILWAUKEE. WISCONSIN, ASSIGNOR 0F ONE-FOURTH T0CLAYTON S. FLINT.

OE MILWAUKEE, WISCONSIN.

SOLDERING COMPOSITION FOR ALUMINUM] No Drawing.

To all whom. it may concern:

Be it known that I, FLOYD A, Awnn'rns. a citizen of the United States,residing at Milwaukee, in the county of lvlilwaukee and State of Iisconsin, have invented certain new and useful Improvemen s inSoldering, Compositions for Aluminum of which the following is a.specification.

This invention relates to soldering compositions. and particularl Y analloy or compo-- sition for soldering or. joining aluminum.

The object of the invention isto provide .an alloy which may 'be used insoldering or joining aluminum, which will have. the same color asaluminum, and which will join the aluminum as perfectly and'strongly asif the joint was formed by acetylene welding. The composition.consistsof the following ingredients?- Per cent. Tin Q. 558. 15 Zinc Aluminum4.19 Antimony 1.22 Phosphor tin e 1.14

In forming'this composition, I first melt the aluminum and then'add'thereto tin in small'quantities, stirring the mixture well. vThis tin ispreferably block tin," that is I I next add thereto the. zinc in smallquantities and inixwell and then add the antimony in small quantities.To this mixture is then added phosphor tin and coincidently with theaddition of the phosphor tin I remove the mixture from the tire andthrow into the mixture either aluminum llux, which is zinc chloride orrosinor' a mixture of horax" and ammonia chloride. The aluminum tluxwhen added to the mix-- turc causes the dirt and impurities in the metalto rise to the topso that they may be skiuuucd ofl'. T

Vhere phosphor tin used as part of the alloy, the solder 'will stick aslong a the aluminum retains its original state. The reason for removingthe material from the 1 lire immediately after addingtlic phosphor tinis to keep the phosphor tin from burn-- ing, as phosphor tin will burnit much heat is applied to it. At the time when the zinc is put into thecomposition there should only .he enough heat to causethc zinc to melt.

The aluminum is used to give color to the composition, that IS to makethe composition Specification of Letters Patent.

.plalnt Patented May 23, 1922..

Application filed December 3, i919. Serial No. 342,264.

'the proportions stated, namely tin 5%, antimony 10 zinc 35)? aluminum5%, graphite 5%, and phosphorus 40%. The phosphor tin cleans and is alsoparticularly adhesive; that is it causes the solder to stick tighterthan it otherwise would do.- Furthermore, as before remarked. by addingphosphor tin tothe alloy. the phosphorus is oxide on the aluminum Againthe zinc hardens the alloy retained and is not burned up in'nnediately,

as would be the case were pure phosphorus used. I have found in actualpractice that a chemical action-takes place when phosphor tin is usedwhich I am unable to ex- In the manufacture of thi solder the percentage of block tin may be slightly increased or decreased. Anyincrease in percentage of aluminum will raise the melting point of thesolder and the aluminum that is being soldered willhave to be brought toa correspondingly high heat before the solder can be applied. If toomuch antimony be added to the composition it will cause the solder to bebrittle. Vere the antimony left dut. then when there is a strain on thepiece of aluminum that is being' repaired with solder that has noantimony in it and the aluminum should expand while cooling, it wouldcause the parts being repaired to crack. lly using antimony, however. inthe solder. if the parts being repaired expand,

there is not much possibility of the parts cracking; for with antimonyin the solder there is considerable expansion andiwmtraction.

No flux is used in applying this solder. 'lhis soldering composition isto be used in soldering hlow-holes, cracks; and broken parts in cast andplate alum inu'm. In use, the parts to be soldered or connected arethoroughly cleaned with file and scraper.

Then the parts to he nepairetl are h atetl t sueh a degree thattht;eompos\tiou het'ore described \\'lll melt hy ruhhin on withoutapplying any heat tlireetly to the eoutpost- 5 tion. After applyin; asmall amount of the composition to the metal. the metal is ruhhetl wellwith an iron ptltltllt or with a wire hrush until the surt'aee is welleoatetl. This is partieularly important. as every pieee of aluminum is('tJYttttt with a tilm ol' oxitle whieh has to he ruhlaal-otl'. am] thealmnimun soldering eomposition applietl at the same time. The alumimnneomposition is applietl in sutlieient tplantitie to till up holes oreraelts unit is then smoothetl oil with an iron patttlle.

The parts to he repairetl may he weltlett hy mean ot' a hlow tUlt'll amtthe joint imnle hy this ahuninum eomposition is stronger than thealuminum itselt l y this means. aluminum may he reatlity soltleretl orjoinwl.

amt inasmueh as the soltler is the same eoloras the aluminum. the jointis not apparent.

l elaim v l. .\s a sottter t'or alumimnn. an alloy ot' aluminum. tin.xiue. antimony amt phospho" tin.

2. A sohleriu; eomposition eousistiir ol the following"ingredientshaving approx mately the proportions statett:

Per rent.

'lin 58.45

Zine Aluminum 4,15) .\ntimony 1.22 35 lhosphor tin 1.14

3. .\s a soltler for aluminum. an alloy of a relatively large proportionof tin. a rela tively large proportion ot' zine. a relatively 4 smallproportion ol' aluminum. amt relatively small proportions of antimonyamt phosphorus. the proportions of antimony amt phosphorus heiug lessthan the propon tion of aluminum. 4..

-l. .\s a soltter for aluminum. an alloy ot' a relatively largeproportion of tin. a relatively large proportion of line. a relativelysmall proportion ot' aluminum. amt rela tiyely small proportions ot'antimony amt h phosphoiztin. the pl'oportion ot' antimon amt phosphortin heing less than the proportion of aluminum.

ln testimony \vhereot l hereunto atlix my signature.

